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WO2002060337A2 - Polymere resorbable enrobe et procede de fabrication associe - Google Patents

Polymere resorbable enrobe et procede de fabrication associe Download PDF

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Publication number
WO2002060337A2
WO2002060337A2 PCT/US2001/048428 US0148428W WO02060337A2 WO 2002060337 A2 WO2002060337 A2 WO 2002060337A2 US 0148428 W US0148428 W US 0148428W WO 02060337 A2 WO02060337 A2 WO 02060337A2
Authority
WO
WIPO (PCT)
Prior art keywords
ceramic
substrate
coating
resorbable
providing
Prior art date
Application number
PCT/US2001/048428
Other languages
English (en)
Other versions
WO2002060337A3 (fr
Inventor
Mukesh Kumar
Original Assignee
Biomet, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Biomet, Inc. filed Critical Biomet, Inc.
Priority to EP01998045A priority Critical patent/EP1341473A4/fr
Priority to AU2002249805A priority patent/AU2002249805A1/en
Publication of WO2002060337A2 publication Critical patent/WO2002060337A2/fr
Publication of WO2002060337A3 publication Critical patent/WO2002060337A3/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L27/58—Materials at least partially resorbable by the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/28—Materials for coating prostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/08—Materials for coatings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L31/148—Materials at least partially resorbable by the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2420/00—Materials or methods for coatings medical devices
    • A61L2420/04—Coatings containing a composite material such as inorganic/organic, i.e. material comprising different phases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]

Definitions

  • This invention generally relates to coated polymer materials and, more particularly, to a resorptive polymer coat having a ceramic polymer blend which, when used individually or in combination, provides a highly tunable resorption time and a means of supplying bone forming elements.
  • the repair of separated or dislocated bone fragments or segments following bone surgeries requires realignment of the separated or dislocated fragments or segments and subsequent secure fixation for promoting proper natural rejoinder of these bone fragments or segments.
  • the presence of relative motion of the bone fragments or segments at a fracture or osteotomy location may result in irritation of the surrounding tissues, nonunion between the bone fragments, and an extension of the time of fracture healing. It is therefore desirable to accomplish as completely as possible an immobilization of the fracture or osteotomy site. This involves the relative fixation of affected bone segments relative to each other and in relation to the surrounding bone structure.
  • Known methods for providing fixation between adjacent bone portions have included the use of metallic plates of varying configurations, which are secured across osteotomies or fracture sites by metallic bone screws.
  • osteosynthesis plates had to be made relatively thick so as to provide the requisite strength and resorption time, which tended to make the osteosynthesis plates have an unwanted cosmetic appearance when implanted.
  • a bioresorbable material having a ceramic and polymer coating.
  • the ceramic and polymer coating increases the tailorability and tuneability of resorption rates and properties and allows for increases in implant design flexibility by virtue of its simplicity. Also as the coating comprises of a resorbable ceramic, it helps in bone integration and formation.
  • a resorptive material includes a polymer and ceramic coating to control the osseoconductive properties of the coating.
  • a resorbable ceramic powder is deposited onto a substrate by use of a resorbable polymer binder. It is possible to use a combination of differing ceramic compositions as well as ceramic powder particle sizes to adjust resorption properties. Similarly, it is possible to use a combination of resorbable polymeric binders in different amounts to adjust resorption time.
  • a material having a biocompatible resorbable ceramic with biologically acceptable cations such as calcium, sodium, potassium and anions of phosphates in various oxidation states, carbonates, bicarbonates and sulfates including but not limited to calcium sodium phosphate, calcium sulfate, hydroxyapatite, calcium carbonate, tricalcium phosphate and octacalcium phosphate or a mixture of resorbable ceramics.
  • a method of forming a resorbable coating material onto a substrate includes the steps of forming a mixture of the polymer binder, a resorbable ceramic powder and a solvent. The mixture is disposed onto the substrate at a fixed thickness. The solvent is either extracted or evaporated off, leaving a coating of ceramic powder coupled to the substrate by a polymer binder.
  • Use of the present invention provides a substrate material coated with a resorbable layer that affects resorption rate.
  • the coating material is formed of a resorbable polymer binder and resorbable ceramic materials.
  • the resorption rate of the coating can be significantly slowed down.
  • the aforementioned disadvantages associated with the currently available resorbable materials have been substantially reduced or eliminated.
  • FIG. 1 is a cross-section of a coated substrate conforming to the teachings of the current invention
  • FIG. 2 is a cross-section of a multi-layer coating conforming to the teachings of the current invention
  • FIG. 3 is a flow chart describing the method of producing the coating of the invention.
  • FIG. 4 is a bone plate formed of the coated material of the invention.
  • FIG. 1 discloses a coating 20 of the current invention disposed on a substrate 21.
  • the primary constituent of the coating 20 is ceramic powder 22.
  • the ceramic powder 22 is a bio-compatible resorbable ceramic with cations of calcium, sodium potassium and anions of phosphates in various oxidation states.
  • the ceramic 22 is a phosphate, carbonate, bicarbonate or sulfate including but not limited to calcium sodium phosphate, calcium sulfate, hydroxyapatite, calcium carbonate, tricalcium phosphate and octacalcium phosphate or mixtures of these resorbable ceramics.
  • the particle sizes of the embedded ceramic 22 being used for the coatings 20 are generally below 200 microns. It is preferable that the particles have a mean size of 50 microns with a distribution of about 25 microns. It is possible to use tailored size distribution such as a bimodal particle size distribution to modify the overall performance of the device.
  • the coating 20 disclosed does not require the use of a ceramic powder binder 23 in the usual sense.
  • binders usually some kind of polymer
  • the subsequent sintering processes ensure structural integrity of powder formed ceramics by joining the individual powder particles together.
  • the binders 23 used in the present invention, and for that matter substrate polymers are biocompatible and resorbable polymers, copolymers or blends such as those composed of lactic acid, glycolic acid, amides, anhydrides, orthroesters, dioxanones and many others.
  • the weight percentage and molecular weight of the binder 23 is chosen to affect the resorption rate of the final structure.
  • the binders 23 are not removed from the resulting structure by means of heat and oxidation.
  • the binder materials 23 remain within the structure until resorbed after implantation.
  • the binder material 23 is combined with the ceramic powder 22 by the use of a solvent 24.
  • the binder polymer 23 is dissolved within the solvent 24 and the ceramic powder 22 is added to form a slurry.
  • the composition of the slurry preferably holds the ceramic powder 22 in suspension in the dissolved polymer/solvent mixture. There may be no chemical interaction between the ceramic powder 22 and this solution.
  • this slurry can also have pore forming agents such as sugar (sucrose or dextrose), salt (sodium chloride or carbonate and bicarbonate) and biologically active agents.
  • the slurry may also have bio-compatible deflocculating agents (usually less than a 1% if any) to assist in keeping the ceramic particles held in suspension in the solvent 24.
  • solvents 24 are but not limited to acetone, pyrrolidone such as N-methyl-2-pyrrolidone, ethyl acetate and ethyl lactate. It is possible to use a mixture of solvents to adjust the density and viscosity of the solution as well as the amount of polymer binder to be dissolved. As with all biomedical applications, the solvents used should be benign and least toxic. As such, the solvent must be removed by well known processes such as vacuum drying or super critical extraction.
  • the binder polymer 23 in the slurry is the same as the substrate polymer 21 which is to be coated. It is also envisioned that the binder polymer 23 can be different than the substrate polymer 21. Medical application demands that the binder 23 and substrate polymer 21 be biocompatible and resorbable. In the event that the binder and substrate polymers are different, the solvent (or mixture of solvents) to be used must be able to dissolve or at least make both the substrate polymer 21 and the binder material 23 sticky.
  • a composite structure would form of resorbable ceramic powder 22 in a resorbable binder polymer matrix 23.
  • This ceramic powder 22 is bound in the polymer matrix 23 of the precipitated resorbable polymer, leaving a resorbable composite which can be used as an implant.
  • the solvents in the slurry When the slurry is poured onto the substrate polymer 21 and is allowed to evaporate on the substrate polymer 21 , the solvents in the slurry also partially dissolves the substrate polymer 21. Eventually, the solvent will evaporate leaving the ceramic powder 22 bound by the binder 23 and partially dissolved substrate polymer 21.
  • the ratio of the binder polymer 23 to the solvent 24 can have a wide range, from very dilute to saturation. If LACTOSORB, offered by Biomet, Inc. of Warsaw, Indiana, is used as binder polymer 23, the ratio of the binder polymer 23 to solvent 24 is between 9 to 12g to 100 ml acetone. For saturation, the ratio is 15g/100ml acetone. In this range of solution composition, the other variable is the ceramic powder 22 volume fraction. By varying the weight percentage of ceramic powder 22 to binder polymer 23, the percentage of polymer matrix 23 in the resulting product can be adjusted. So, the slurry could have a composition of dilute to saturated solution with particle volume fraction ranging from sparse to heavy.
  • the preferred composition of the slurry will depend on the application or the characteristics of the coating. Intuitively, if a longer resorption time were required, the binder polymer 23 would be close to saturation (almost 15g of LACTOSORB per 100 ml acetone. For devices showing faster resorption, a lower concentration solution would be used. The other variable i.e., ceramic powder 22 volume fraction should not affect resorption rate, but the ceramic composition will affect resorption characteristics.
  • coating layers can be applied to the substrate. These layers can be in any order and can have varying ceramic volume fractions ranging from none to heavy loading as well as varying powder size. By varying the ceramic material, and the binder, resorption rates can be varied.
  • the biocompatible resorbable ceramic coating 20 is formed as follows.
  • a binder polymer 23 is dissolved within a solvent 24.
  • the ceramic powder 22 is mixed into the solvent 24 material so as to hold the ceramic powder 22 in suspension. Deflocculating additives may be used to hold the ceramic powders 22 in suspension within the mixture.
  • the mixture is then deposited onto a substrate material 21. Should the substrate material 21 be of a polymer which is dissolvable by the particular solvent used, the surface layer of the substrate material begins to dissolve.
  • the solvent is removed by evaporation. The ceramic particles 22 are then imbedded within the dissolved surface layer of the substrate as well as in the binder material.
  • the slurry may be cast on a glass or other substrate with or without the benefit of spreading assisted by spinning.
  • laminated structures of resorbable ceramic-polymer composites are fabricated.
  • the individual laminates can have varying particle size distribution, loading and composition.
  • Pore forming agents can be added to the solvent. These agents function to create pores within the binder material and allow for a variation of the resorption time.
  • a resorbable substrate material 21 having a resorbable polymer ceramic coating 20 is formed.
  • the coating allows a user to adjust the resorption rate of the material.
  • a standard bone plate 34 is shown using the aforementioned material.
  • the resorption rate of a bone plate used in orthopedic procedures of the current invention can have tailorable resorption properties.
  • the variable resorption rates lead to a significant benefit not seen in prior bone plate structures.
  • the resorption of the bone plate can be significantly slower than those bone plates formed by the substrate material alone. In particular, this can be useful in patients where bone regrowth would be expected to be much slower and, therefore, the support caused by the bone plate would need to be utilized by the patient for a much longer period of time.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Medicinal Chemistry (AREA)
  • Dermatology (AREA)
  • Chemical & Material Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Vascular Medicine (AREA)
  • Materials For Medical Uses (AREA)

Abstract

La présente invention concerne un matériau biorésorbable comprenant un revêtement polymère et céramique. Ce revêtement permet d'augmenter l'adaptabilité des propriétés et des taux de résorption et, grâce à sa simplicité, d'améliorer la souplesse de conception.
PCT/US2001/048428 2000-12-15 2001-12-14 Polymere resorbable enrobe et procede de fabrication associe WO2002060337A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01998045A EP1341473A4 (fr) 2000-12-15 2001-12-14 Polymere resorbable enrobe et procede de fabrication associe
AU2002249805A AU2002249805A1 (en) 2000-12-15 2001-12-14 Coated resorbable polymer and method of making the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/738,615 US6518328B2 (en) 2000-12-15 2000-12-15 Coated resorbable polymer and method of making the same
US09/738,615 2000-12-15

Publications (2)

Publication Number Publication Date
WO2002060337A2 true WO2002060337A2 (fr) 2002-08-08
WO2002060337A3 WO2002060337A3 (fr) 2003-02-27

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ID=24968746

Family Applications (1)

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PCT/US2001/048428 WO2002060337A2 (fr) 2000-12-15 2001-12-14 Polymere resorbable enrobe et procede de fabrication associe

Country Status (4)

Country Link
US (1) US6518328B2 (fr)
EP (1) EP1341473A4 (fr)
AU (1) AU2002249805A1 (fr)
WO (1) WO2002060337A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007127868A3 (fr) * 2006-04-27 2008-01-10 Phillips Plastics Corp Stent composé
US9101505B2 (en) 2006-04-27 2015-08-11 Brs Holdings, Llc Composite stent

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CA2433550A1 (fr) * 2001-01-02 2002-07-11 Advanced Ceramics Research, Inc. Compositions et procedes destines a des applications biomedicales
US20020120340A1 (en) * 2001-02-23 2002-08-29 Metzger Robert G. Knee joint prosthesis
US7497874B1 (en) 2001-02-23 2009-03-03 Biomet Manufacturing Corp. Knee joint prosthesis
ATE359836T1 (de) * 2001-09-24 2007-05-15 Millenium Biologix Inc Poröse keramische komposit-knochenimplantate
US7067169B2 (en) * 2003-06-04 2006-06-27 Chemat Technology Inc. Coated implants and methods of coating
DE102004063794A1 (de) * 2004-12-30 2006-07-13 Universität Duisburg-Essen Implantat
US7740794B1 (en) * 2005-04-18 2010-06-22 Biomet Sports Medicine, Llc Methods of making a polymer and ceramic composite
EP3517137A1 (fr) 2005-11-14 2019-07-31 Biomet 3I, LLC Dépôt de nanoparticules discrètes sur une surface d'implant
US7790080B2 (en) * 2005-11-22 2010-09-07 National Taiwan University Method for forming a bioartificial guidance conduit
CN100428964C (zh) * 2006-06-29 2008-10-29 武汉理工大学 RGD多肽接枝聚(羟基乙酸-L-赖氨酸-L-乳酸)/β-磷酸三钙复合材料及其制备方法
EP2079401B1 (fr) * 2006-10-24 2019-05-22 Biomet 3i, LLC Déposition de nanoparticules discrètes sur la surface nanostructurée d'un implant
US8163028B2 (en) 2007-01-10 2012-04-24 Biomet Manufacturing Corp. Knee joint prosthesis system and method for implantation
JP5448842B2 (ja) 2007-01-10 2014-03-19 バイオメト マニファクチャリング コーポレイション 膝関節プロテーゼシステムおよび埋込み方法
US8562616B2 (en) 2007-10-10 2013-10-22 Biomet Manufacturing, Llc Knee joint prosthesis system and method for implantation
US8328873B2 (en) 2007-01-10 2012-12-11 Biomet Manufacturing Corp. Knee joint prosthesis system and method for implantation
US8187280B2 (en) 2007-10-10 2012-05-29 Biomet Manufacturing Corp. Knee joint prosthesis system and method for implantation
US9302030B2 (en) * 2007-08-07 2016-04-05 Abbott Cardiovascular Systems Inc. Prohealing piezoelectric coatings
WO2009097218A1 (fr) 2008-01-28 2009-08-06 Biomet 3I, Llc Surface d'implant présentant un caractère hydrophile augmenté
US8444699B2 (en) * 2010-02-18 2013-05-21 Biomet Manufacturing Corp. Method and apparatus for augmenting bone defects
US8641418B2 (en) 2010-03-29 2014-02-04 Biomet 3I, Llc Titanium nano-scale etching on an implant surface
EP2828100B1 (fr) 2012-03-20 2018-05-16 Biomet 3i, LLC Traitement de surface pour une surface d'implant

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007127868A3 (fr) * 2006-04-27 2008-01-10 Phillips Plastics Corp Stent composé
US9101505B2 (en) 2006-04-27 2015-08-11 Brs Holdings, Llc Composite stent
US9155646B2 (en) 2006-04-27 2015-10-13 Brs Holdings, Llc Composite stent with bioremovable ceramic flakes

Also Published As

Publication number Publication date
US6518328B2 (en) 2003-02-11
WO2002060337A3 (fr) 2003-02-27
EP1341473A4 (fr) 2006-05-31
AU2002249805A1 (en) 2002-08-12
EP1341473A2 (fr) 2003-09-10
US20020127391A1 (en) 2002-09-12

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